package com.itheima.reggie.filter;

// 检查用户是否已经完成登录

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")

public class LoginCheckFilter implements Filter {
    // 路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        // 定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg", // 移动端发送短信
                "/user/login"  // 移动端登录
        };
        // 2. 判断这次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理，直接放行
        if(check){
            log.info("请求{} 不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4 - 1.判断登录状态，如果登录，直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已经登录，id为：{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");

            BaseContext.setCurrentId(empId);
//            long id = Thread.currentThread().getId();
//            log.info("当前线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }

        //4 - 2.判断移动端登录状态，如果登录，直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已经登录，id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);
//            long id = Thread.currentThread().getId();
//            log.info("当前线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }



        //5.如果未登录，则返回未登录结果,通过输出流的方式向客户端发送数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

//        log.info("拦截到请求：{}",request.getRequestURI());
//        filterChain.doFilter(request,response);
    }

    /*
    路径匹配，检查路径是否一致
    * @param
    * */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
